Logarithmic calculating mechanism



Nov. 6, 1934. R. B. WASSON LOGARITHMIG CALCULATING MECHANISM Original Filed Nov. 20, 1925 2 Sheets-Sheet l Nov. 6, 1934. R. B. WASSON LOGARITHMIC CALCULATING MECHANISM Original Filed Nov. 20, 1925 2 Sheets-Sheet 2 INVENTOR jjafier/ B. ,Vassofl BY mbuflv ATTORNEYS Patented Nov. 6, 1934 LOGARITHMIC CALC ULATING MECHANISM Robert B. Wasson, Cranford, N. J.

Continuation of application Serial No. 70,424,

November 20, 1925.

This application June 12,

1930, Serial No. 460,579

1 Claim.

My invention relates to improvements in indicating devices and more particularly logarithmic calculating mechanisms or instruments, which for convenience I have called calculating devices. In this type of calculating device different factors operate a mechanism which indicates a desired resultant of the factors.

Many attempts have been made in the prior art to obtain an instrument which will give continuously a desired resultant of certain determinable and perhaps continuously changing fac tors. However, such instruments have been limited in their use to a relatively small group of factors. Indicators of resultants of most of the factors have not been accurate, but rather give resultants which are only approximations of the actual value desired.

One of the primary objects of my invention is to overcome the disadvantages outlined above.

Another object of my invention is to obtain a continuously indicated resultant from one or more continuously varying factors.

A further object of my invention is to obtain means for continuously or otherwise indicating an accurate resultant of one or more varying factors.

Other objects and advantages of my invention will become apparent from the following description and drawings.

My device consists in the use of co-acting movable elements as, for example, a moving dial with a co-acting movable pointer, which 00- acting movable elements are each individually operated by a mechanism which causes a displacement or movement of the respective coacting movable element, which movement is proportional to a logarithm of one of the varying factors of the computation. It is, of course, possible to have more than 2 factors inasmuch as several factors may be used to give a resultant and this resultant then used as a single factor to bring about the displacement of the co-acting movable elements. In using a dial and pointer arrangement as the indicating elements, the dial may be graduated logarithmically. In this case when the hand and dial are caused to move in opposite directions, the product of the two factors, one or both of which may or may not be continuously changing, will be 0 indicated by the pointer on the dial. The quotient of the two varying factors may be obtained by causing the pointer and dial to move in the same direction.

It is imperative in this type of mechanism,

55 that there be straight line motion so that the logarithmic scales are added or subtracted. Therefore, mechanisms that do not give true straight line motions are inoperative as far as giving a final reading from the addition or sub traction of logarithms or values proportional t them.

In my device the contributing factors and the result desired may be constantly varied and therefore, I employ means to continuously insure the correct displacement of the indicating elements in the graduation of the dial. For example, provision may be made to care for the sheet 01 other constantly multiplying and dividing factors.

For the sake of example, I have shown my device as applied to a continuous horse power indicator and have also shown a torquemeterand speed meter which indicate the contributing factors to the horse power meter. In practice I prefer to group the horse power indicator, the torque indicator and the speed indicator or tachometer so that the three may be observed at a glance, and the comparative as wellas the final reading easily made. I have shown the hand of the horse power indicator moved by one of the factors and the dial of the horse power indicator moved by another of the factors. The drawings disclose a means for carrying this out, but it will be understood that various other means are possible without departing from my invention. For example, the logarithmic displacement may be applied directly to the coacting movable elements of the resultant indicator. Y

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a broken front elevation of an apparatus embodying my invention.

Figure 2 is a broken sectional rear elevation thereof showing the operating mechanism.

Figure 3 is a cross section on the line 3-3 of Figure 2, and

Figure 4 is a cross section on the line 4-4 of Figure 2.

As shown, I provide a suitable containing casing 10 with a torque dial 11 thereon suitably graduated, a tachometer or speed indicating dial 12 also suitably marked, and a horse power indicator having a dial l3 and with graduations 14 near the periphery of the dial. The numbering on the dial 13 may be duplicated if desired and arranged for easy reading as at 14 and 15. The dial 13 is adapted to revolve whereas the dials d s line motion along 28 and 28'. which motion li ne;

Aha}?! dresses? m 1 a, :pending application, Serial No. 70.424 1 WW? m A end hr oscillate. crating. against said wand. cam

for exthe oi the N mains with J which is m lone whlsl d oo qr m: loga ithms, t0 the second hgarithxnic a; w e'end torque value witha second reac i d ste hoj and cam 26 which will metical resultant odsaidiognri V t omen M i r t be added or subtracted.

t p inter and may I c'a Wei; l w u {943w I Y b9 two or three windinss cater n meme tachometer 12 and the pulley:

and 26' respec V the motions along the lines 28 and This device is admits mil, It will be a M m. n w ,4 t m Mm E W m m m v w m 1 M m e g m w m W o h wh n u m 1 d m m u W k c kiwi Hm 4 B. t m 0 mm mm W c w a. NW N M m m on w w M n M twe e m m e u mom n.. m w w m s a mw. m Z w M an a n .n 1 sm m. m m m w s2 m m V m .0 d w t o J o d e d e m w m m m 1 o m w w s w 3 m n t m m 7 w a w m t m on m m m I T .A m v respectively. A corresponding ments per pound and the dial 11:; the weight of the losiop s oum M sha 21 will import a. elements. cnn flwwhichmcvementwillof indicatin -meme cam 26 by the wei tween said se on rescttweodevicown n. r erm logaflthmw gam. in lw do pulled connec on sold but oscillate to express the device and logarithmic m 8:;Mr

to said second movable l r-paglg' ,vit will impart a saidindicator is a daptedote The dials cothe pointer 16 cam 26 will be transferred to 1'1 with horse power indicator and move 18 with the dial 13. site direction.

12 is a frame 19 .fimr wl is pulley 22 26 transferred to the no It is essential to the operation that the motione er e s xtends rithm '1, which by andthedial money; pound. o v This shaft is whichm v h modem: 41-. withthe parting from herefore, do not wjgh mi 'll .nmnorais 'mlsmnmi nis ic a i uoflh Y r m we out arithmlcaily le 'in m ml, with H logarithms of Pfihbldb lf t sn the said. first logarith i -minced a; p Y =1 .l thecaiimtion means for imhar iw h i ll Q-iw ldl zi IUD- innie desired'constant V ts, s7 and 31' of the belt 28 and 28' 2 also car Z eonnectedtoabeltwwhiche 1mm Poms- 2 an import proper rotary movement The p whom i i We and in thiswpy takeoageo 32 onthe back .01 the rectum besides .lhe management hm 5 42 which is"- lhle'iihhfl carries the logarithmic first movable I indioetonmt.

e bell: 28' extends ersjfiand l7. 29, passes over the -the bracket 34, through a means,

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11, the pointer supporting the shalt tionwith the mm 21 has a driving cendotthisbgltfllspro- .3! to hes]; the belt taut.

is-cerried by I shut ion:-

29 on tlw'shelt 30" which.

. or end of the follower 27. could be setmanua angular displacement till-impolite!- 11;. As the the A 3 end give metersnnd ins oscillate,

18 o! the horse power them 112:. i as low guith. pulley 36. also on said- 1 .n. ..n o! themedand torque, D

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